Hand-held power tool, in particular a sander

ABSTRACT

A hand-held power tool, in particular a sander, includes a housing ( 10 ) and a motor ( 12 ) located in the housing ( 10 ). A driven shaft ( 16 ) that extends from a face end ( 14 ) of the housing ( 10 ) is drivable by the motor ( 12 ). A suction conduit ( 18 ) extends at least partway through the housing ( 10 ). The suction conduit ( 18 ) opens as an intake at the face end ( 14 ) of the housing ( 10 ).

PRIOR ART

The invention is based in particular on a hand-held power tool asgenerically defined by the preamble to claim 1.

A hand-held power tool embodied as a so-called Delta sander is alreadyknown, with a housing and a motor located in the housing, by way ofwhich motor a driven shaft, extending from one face end of the housing,can be driven. The hand-held power tool has a suction conduit, extendingthrough the housing, which discharges on an underside of the housing, inthe direction of the driven shaft, spaced apart from the face end of thehousing. The suction conduit extending in the housing communicates,sealed off from the outside via an elastic adapter, with a suctionconduit of a triangular tool receptacle, which is coupled to the drivenshaft and is drivable via the driven shaft. The suction conduit of thetool receptacle is coupled, again sealed off from the outside, with asuction conduit of a triangular sanding plate, which is detachablysecured to the tool receptacle and to which a sandpaper can be secured.

ADVANTAGES OF THE INVENTION

The invention is based on a hand-held power tool, in particular asander, having a housing and a motor located in the housing, by way ofwhich motor a driven shaft, extending from a face end of the housing, isdrivable, and having a suction conduit, extending at least partwaythrough the housing.

It is proposed that the suction conduit includes an intake opening atthe face end, as a result of which especially advantageous suctionextraction can be attained with only a few, or even without any,additional components.

If the suction conduit extends, in at least one region, by at least 180°and especially advantageously 360° around the driven shaft, anadvantageous suction extraction that is uniform over a sanding face canbe attained, and coincidence of the suction conduit with correspondingsuction conduits can be assured in a simple way. In the region of thedriven shaft, the suction conduit may be either undivided in itscircumferential direction or subdivided into individual segments.

In a further feature of the invention, it is proposed that the suctionconduit, in at least one region, has a spacing of less than 1 cm fromthe driven shaft, and especially advantageously in at least one regiondirectly adjoins the driven shaft. As a result, despite the suctionconduit, an advantageously small face end can be attained, making itpossible to use the hand-held power tool handily even in corner areas,and furthermore, an advantageously large bearing area on the drivenshaft for coupling to a tool receptacle can be attained, in order toachieve the smallest possible values of pressure per unit of surfacearea. In principle, however, it is also possible for the driven shaft tobe separated from the suction conduit by a partition, as a result ofwhich soiling of the driven shaft could be avoided.

In addition, a tool receptacle with at least one suction conduit isproposed, which is intended for installation in a hand-held power toolof the generic type here. The term “intended” should be understood inthis context to mean in particular “especially equipped” and/or“designed”. Moreover, the term “tool receptacle” should be understood inparticular as a means for coupling to the driven shaft, such as inparticular a tool receptacle to which a sanding plate can be secured, asis often the case for a Delta sander, or a sanding plate itself that canbe secured directly to the driven shaft, as is often the case inhand-held power tools with an oscillating drive, and to which asandpaper can be secured.

If the suction conduit in the tool receptacle has at least onetransverse conduit segment which extends at least substantially parallelto a sanding plane, suction extraction can be attained flexibly fromvarious regions of the sanding plane, particularly from a radially outerregion toward the face end of the hand-held power tool. Moreover,conventional sanding sheets can be used, which radially outside the faceend of the hand-held power tool have recesses for vacuuming out dust.

In a further feature of the invention, it is proposed that thetransverse conduit segment is embodied as open in the direction towardthe sanding plane, as a result of which especially simple manufacturecan be attained, in particular without complicated gluing procedures or,in a casting process, without using cores. The tool receptacle can alsobe embodied in particular in one piece.

Furthermore, a system having a hand-held power tool in particular of thegeneric type in question, and with a tool receptacle with a suctionconduit is proposed, wherein the suction conduit in the housing of thehand-held power tool and the suction conduit in the tool receptacle areintended for direct coupling. The term “direct coupling” should beunderstood in particular as a coupling without intervening, additionalcomponents. By means of the provisions according to the invention, it ispossible in particular to dispense with additional adapters,installation space, weight, complicated installation, and expenses.

In a further feature of the invention, it is proposed that the suctionconduit in the housing of the hand-held power tool and the suctionconduit in the tool receptacle, in the installed state of the toolreceptacle, are coupled via a region that is open toward the outside, asa result of which simple coupling without additional components can beattained, and in particular advantageous suction extraction of dust froman outer region of the suction conduit can be attained via the openregion.

The provisions according to the invention can be employed in allhand-held power tools that appear suitable for the purpose to oneskilled in the art, such as power drills, and preferably sanders, suchas Delta sanders, eccentric sanders, and angle sanders, and especiallypreferably in hand-held power tools with an oscillating drive, in whichan advantageous coincidence between the suction conduit in the housingof the hand-held power tool and the suction conduit in the toolreceptacle can be achieved especially simply.

DRAWINGS

Further advantages will become apparent from the ensuing description ofthe drawings. In the drawings, one exemplary embodiment of the inventionis shown. The drawings, description and claims include numerouscharacteristics in combination. One skilled in the art will expedientlyconsider these characteristics individually as well and put themtogether to make useful further combinations.

Shown are:

FIG. 1, a hand-held power tool in a side view, with one housing halfremoved;

FIG. 1A, a hand-held power tool in a side view, with one housing halfremoved, highlighting particular dimensions;

FIG. 2, an enlarged detail of the hand-held power tool in the region ofthe driven shaft with a sanding plate and a sandpaper, in a first view;

FIG. 3, the detail of FIG. 2 in a second view, without the sandpaper;

FIG. 4, the sanding plate of FIG. 2 from above;

FIG. 5, the sanding plate of FIG. 2 from below; and

FIG. 6, an enlarged detail of the hand-held power tool of FIG. 2, with asaw blade.

DESCRIPTION OF THE EXEMPLARY EMBODIMENT

FIG. 1 shows a hand-held power tool, embodied by a hand-guided sander,with a substantially L-shaped, longitudinally divided housing 10 and anelectric motor 12, located in the housing 10, by way of which a drivenshaft 16 extending from a front face end 14 of the housing 10 can bedriven in oscillating fashion. On an underside of the housing 10, asuction conduit 18 is integrated with the housing 10 and extends in thelongitudinal direction of the housing 10, to an outlet stub 28, at oneend of the hand-held power tool facing away from the driven shaft 16beginning at the face end 14 and according to the invention includes anintake opening at or in this face end. In the front region, angled byapproximately 90°, the housing 10 has a smaller diameter than in theregion of the electric motor 12. To compensate for this fluidically, thesuction conduit 18, in the front, angled region of the hand-held powertool in the radial direction to the driven shaft 16, has a greaterlength than in the region of the electric motor 12 in the radialdirection to the electric motor 12. In addition or alternatively to alongitudinal division, the housing 10 may also be embodied as dividedcrosswise; for instance, the housing 10 may be embodied with a frontgearbox part.

In the direction toward the free end of the driven shaft 16, the suctionconduit 18 adjoins the driven shaft 16 directly in a region following abearing 30 and extends 360° around the driven shaft 16 and is extendedin the manner of an annular conduit past a bearing flange 32 of thedriven shaft 16, to the outside from the housing 10. On the face end 14,the suction conduit 18 forms an annular gap.

FIG. 1A is included to highlight particular dimensions of a radialextent from an outer edge of bearing flange (32) and an inner edge ofhousing (10). As shown in FIG. 1A, the bearing flange (32) extends 360°around the driven shaft (16) in a plane perpendicular to thelongitudinal direction of the driven shaft (16). The bearing flange isdefined by a radial distance R_(bf) extending from an outer edge of thedriven shaft (16) to an outer edge of the bearing flange (32). Thesuction conduit (18) operates as an intake, shaped as an annular gap onthe face end (14) of the housing (10) between the bearing flange (32) ofthe driven shaft (16) and the housing (10) in the plane perpendicular tothe longitudinal direction of the driven shaft (16).

The angular gap is formed by a radial distance R_(g) between an outeredge of the bearing flange (32) facing the housing (10) in the planeperpendicular to the longitudinal direction of the driven shaft (16) andan inner edge of the housing (10) facing the bearing flange (32) andextending perpendicular to the face end (14) of the housing (10). Theradial distance R_(g) is measured in the plane perpendicular to thelongitudinal direction of the driven shaft (16). The annular gapincludes a radial extent that is defined by the radial distance R_(g).The driven shaft (16) is defined by a radius R_(s) extending from anaxial center of the driven shaft (16) to an outer edge of the drivenshaft (16). The radial extent of the annular gap is smaller than adiameter of the driven shaft (16) that is equal to two times the radiusR_(s).

In FIGS. 2 and 3, a tool receptacle formed by a sanding plate is securedto the driven shaft 16; it has a triangular base with convexly curvedside edges (FIGS. 4 and 5). The tool receptacle has a support plate 40.The support plate 40 has a recess 44 at its center; it is attached bythis recess to the driven shaft 16 and, with a fastening screw 34screwed onto the driven shaft 16, is pressed in the axial directionagainst a bearing face of the bearing flange 32 of the driven shaft 16.

The tool receptacle furthermore has a rubber-elastic foamed plate part36, which is secured to or foamed onto the support plate 40 on a sidefacing away from the hand-held power tool, and a hook-and-loop closurelayer 38 is secured to the side of the plate part that faces away fromthe hand-held power tool.

The tool receptacle has six substantially L-shaped corresponding suctionconduits 20, distributed uniformly over the circumference. Each of thesuction conduits 20 has a respective tapering transverse conduit segment22, extending radially inward from a radially outer region of the toolreceptacle and extending essentially parallel to a sanding plane 24, andthis transverse conduit segment is adjoined in the radially inner regionby an axial conduit segment 42 that extends through a remainder of thefoamed plate part 36 and through the support plate 40. The axial conduitsegment 42 is spaced apart inward in the radial direction from a centralrecess 46 in the hook-and-loop closure layer 38 and in the plate part36, so that radially inside each of the suction conduits 20 a respectiveannular rib segment is created, which can advantageously be used forholding a piece of sandpaper 48.

The transverse conduit segments 22 of the suction conduits 20 areembodied as open in the direction toward the sanding plane 24 and arenot closed, except for suction extraction openings 50 in the sandpaper48 in the direction of the sanding plane 24, until the sandpaper isinstalled. The suction extraction openings 50 in the sandpaper 48, whenthe sandpaper is installed, each come to coincide with the suctionconduits 20 in their radially outer region. In principle, it would alsobe conceivable for the tool receptacle to have at least one already atleast partly closed transverse conduit segment; for instance, atransverse conduit segment made in the support plate 40 could be closedby the foamed plate part 36 in the axial direction, and/or a transverseconduit segment made in the foamed plate part 36 could be produced asalready at least partly closed in the axial direction by a core, and/orcould be embodied as at least partly closed in the axial direction bythe hook-and-loop closure layer 38.

The suction conduit 18 in the housing 10 of the hand-held power tool andthe suction conduit 20 in the tool receptacle are coupled directly, thatis, without an intervening component, via a region 26 that is open tothe outside. The open region 26 is formed by an annular gap between theface end 14 of the housing 10 and a top side 52 of the tool receptacle.The spacing between the face end 14 of the housing 10 and the top side52 of the tool receptacle, in the axial direction of the driven shaft16, is preferably less than 15 mm, and especially preferably less than 5mm, and in the present exemplary embodiment, it is 1 mm. The axialconduit segments 42 of the suction conduits 20 of the tool receptaclecome to rest, upon installation of the tool receptacle, directly withinthe annular gap formed in the face end 14 by the suction conduit 18.

In FIG. 6, the hand-held power tool is shown with a tool 54 formed by asaw blade. In a corresponding use of the hand-held power tool, sawdustproduced can likewise be vacuumed away via the suction conduit 18.

LIST OF REFERENCE NUMERALS

-   -   10 Housing    -   12 Motor    -   14 Face end    -   16 Driven shaft    -   18 Suction conduit    -   20 Suction conduit    -   22 Transverse conduit segment    -   24 Sanding plane    -   26 Region    -   28 Outlet stub    -   30 Bearing    -   32 Bearing flange    -   34 Fastening screw    -   36 Plate part    -   38 Hook-and-loop closure layer    -   40 Support plate    -   42 Axial conduit segment    -   44 Recess    -   46 Recess    -   48 Sandpaper    -   50 Suction extraction opening    -   52 Topside    -   54 Tool

1. A hand-held power tool, in particular a sander, comprising a housing(10) and a motor (12), which is located in the housing (10) and by whicha driven shaft (16), extending from a face end (14) of the housing (10),is drivable, the driven shaft (16) extending in a longitudinaldirection, and further comprising a suction conduit (18), extending atleast partway through the housing (10), wherein the suction conduit (18)extends in the longitudinal direction of the driven shaft (16) past abearing flange (32) of the driven shaft (16) to an outside of thehousing (10), wherein the bearing flange (32) extends 360° around thedriven shaft (16) in a plane perpendicular to the longitudinal directionof the driven shaft (16), wherein the bearing flange is defined by aradial distance R_(bf) extending from an outer edge of the driven shaft(16) to an outer edge of the bearing flange (32), wherein the suctionconduit (18) operates as an intake, shaped as an annular gap on the faceend (14) of the housing (10) between the bearing flange (32) of thedriven shaft (16) and the housing (10) in the plane perpendicular to thelongitudinal direction of the driven shaft (16), wherein the angular gapis formed by a radial distance R_(g) between an outer edge of thebearing flange (32) facing the housing (10) in the plane perpendicularto the longitudinal direction of the driven shaft (16) and an inner edgeof the housing (10) facing the bearing flange (32) and extendingperpendicular to the face end (14) of the housing (10), wherein theradial distance R_(g) is measured in the plane perpendicular to thelongitudinal direction of the driven shaft (16), wherein the annular gapincludes a radial extent that is defined by the radial distance R_(g),wherein the driven shaft (16) is defined by a radius R_(s) extendingfrom an axial center of the driven shaft (16) to an outer edge of thedriven shaft (16) and wherein the radial extent of the annular gap issmaller than a diameter of the driven shaft (16) that is equal to twotimes the radius R_(s).
 2. The hand-held power tool as recited in claim1, wherein the suction conduit (18) extends, in at least one region, byat least 180° around the driven shaft (16).
 3. The hand-held power toolas recited in claim 2, wherein the suction conduit (18) extends, in atleast one region, by at least 360° around the driven shaft (16).
 4. Thehand-held power tool as recited in claim 1, wherein the suction conduit(18) has an inner radial limitation, in at least one region, whichcomprises a spacing of less than 1 cm from the driven shaft (16).
 5. Thehand-held power tool as recited in claim 4, wherein the suction conduit(18), in at least one region, directly adjoins the driven shaft (16). 6.The hand-held power tool as recited in claim 1, wherein the suctionconduit (18) comprises a chamber portion extending from the face end(14) of the housing (10) in an axial direction of the driven shaft (16),the chamber portion surrounding the driven shaft (16).
 7. The hand-heldpower tool as recited in claim 6, wherein after the chamber portionsurrounding the driven shaft (16), the suction conduit (18) extends as acavity along an underside of the motor (12) for the entire length of themotor (12).
 8. The hand-held power tool as recited in claim 1, whereinthe suction conduit (18) is integrated at an underside with the housing(10).
 9. The hand-held power tool as recited in claim 1, wherein thesuction conduit (18) extends in a longitudinal direction of the housing(10) from a housing end opposite the face end (14) that is proximate thedriven shaft (16).
 10. The hand-held power tool as recited in claim 1,wherein the suction conduit (18) extends from the face end (14) of thehousing (10) to an exhaust end of the housing (10) comprising an outletstub (28).
 11. The hand-held power tool as recited in claim 1, whereinthe housing (10) has a front part in which the driven shaft (16) islocated and which has a bottom face comprising the face end (14),wherein the housing (10) further comprises a main part that extendslongitudinally in a main direction and which forms an angle with thelongitudinal direction of the driven shaft (16), wherein the suctionconduit (18) extends in the front part and has a first radial extentperpendicular to the longitudinal direction of the driven shaft (16),wherein the suction conduit (18) extends in the main part along the maindirection and has a second radial extent perpendicular to the maindirection, and wherein the second radial extent in the main part issmaller than the first radial extend in the front part.
 12. Thehand-held power tool as recited in claim 1, wherein the suction conduit(18) is an annular conduit.
 13. The hand-held power tool as recited inclaim 1, wherein the suction conduit (18) extends past a bearing flange(32) of the driven shaft (16) to outside of the housing (10).
 14. Thehand-held power tool as recited in claim 1, wherein the suction conduit(18) comprises an annular gap.
 15. A system comprising a hand-held powertool, in particular a sander, comprising a housing (10) and a motor(12), which is located in the housing (10) and by which a driven shaft(16), extending from a face end (14) of the housing (10), is drivable,the driven shaft (16) extending in a longitudinal direction, and furthercomprising a first suction conduit (18), extending at least partwaythrough the housing (10), wherein the first suction conduit (18) extendsin the longitudinal direction of the driven shaft (16) past a bearingflange (32) of the driven shaft (16) to an outside of the housing (10),wherein the first suction conduit (18) operates as an intake, shaped asan annular gap on the face end of the housing (10) between the bearingflange (32) of the driven shaft (16) and the housing (10) in a planeperpendicular to the longitudinal direction of the driven shaft (16),wherein the annular gap is formed by a radial distance R_(g) between anouter edge of the bearing flange (32) facing the housing (10) in theplane perpendicular to the longitudinal direction of the driven shaft(16) and an inner edge of the housing (10) facing the driven shaft (16)and extending perpendicular to the face end (14) of the housing (10),wherein the radial distance R_(g) is measured in the plane perpendicularto the longitudinal direction of the driven shaft (16), wherein theannular gap includes a radial extent that is defined by the radialdistance R_(g) wherein the driven shaft (16) is defined by radius R_(s)extending from an axial center of the driven shaft (16) to an outer edgeof the driven shaft (16) and wherein the radial extent of the annulargap is smaller than a diameter of the driven shaft (10) that is equal totwo times the radius R_(s), the system further comprising a toolreceptacle with a second suction conduit (20), wherein the first suctionconduit (18) in the housing (10) of the hand-held power tool and thesecond suction conduit (20) in the tool receptacle are intended fordirect coupling such that in an installed state of the tool receptacle,wherein the first suction conduit (18) and the second suction conduit(20) are coupled via a region (26) that is open in a radial directiontowards the outside of the hand-held power tool and the tool receptacle,wherein the radial direction is perpendicular to the longitudinaldirection of the driven shaft (16), wherein the region (26) extendsbetween the face end (14) of the housing (10) and a top side (52) of thetool receptacle and wherein the top side (52) of the tool receptacle isoriented in an installed state of the tool receptacle towards the faceend of the housing (10).
 16. The hand-held power tool as recited inclaim 15, wherein the open region (26) comprises an annular gap.
 17. Thehandheld power tool as recited in claim 15, wherein a spacing extendingin an axial direction between the face end (14) of the housing (10) andtop side (52) of the tool receptacle is 1 mm.